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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2011
Share-Based Compensation [Abstract]  
Schedule Of Weighted Average Option Fair Values And Assumptions
    

Years Ended December 31,

    

2011

  

2010

  

2009

Weighted average fair value of grants

   $12.30    $ 9.56    $ 5.32

Dividend yield

   1.46%    1.51%    2.35%

Volatility

   32.72%    33.43%    32.53%

Risk-free interest rate

   0.28% - 5.61%    0.32% - 5.67%    0.69% - 4.63%

Expected life (in years)

   6.14    5.98    5.85
Schedule Of Compensation Cost For Stock Options And Unvested Shares
Schedule Of Stock Option Activity

Stock Options

  Shares     Weighted
Average
Price
    Weighted-Average
Remaining
Contractual Term
    Aggregate
Intrinsic
Value
 

Outstanding at January 1, 2011

    5,404,223      $ 26.85        6.29      $ 66,329,686   

Granted

    770,350        40.98       

Exercised

    (1,333,185     24.10       
       

Forfeited/Expired

    (527,344     31.79       
 

 

 

   

 

 

   

 

 

   

 

 

 

Outstanding at December 31, 2011

    4,314,044      $ 29.61        7.01      $ 34,899,200   
 

 

 

       

Vested and expected to vest at December 31, 2011

    3,659,049      $ 28.51        6.55      $ 32,886,227   

Exercisable at December 31, 2011

    2,805,172      $ 27.76        5.84      $ 26,371,747   
Schedule Of Unvested Share Activity

Unvested Shares

   Shares     Weighted-Average
Grant Date Fair
Value
 

Nonvested at January 1, 2011

     950,097      $ 29.83   

Granted

     341,876        38.81   

Vested

     (386,338     32.84   

Forfeited

     (292,260     30.03   
  

 

 

   

 

 

 

Nonvested at December 31, 2011

     613,375      $ 32.44